UDC NATIONAL STANDARD OF GB THE PEOPLE S REPUBLIC OF CHINA P GB/T 12459-2005 Replace GB/T 12459-1990 Steel Butt-Welding Seamless Pipe Fittings 钢制对焊无缝管件 Issued on February 25, 2005 Implemented on August 1, 2005 Jointly issued by the General Administration of Quality Supervision, Inspection and Quarantine (GAQSIQ) and the Standardization Administration of China (SAC)
Contents 1 Scope...1 2 Normative Reference...1 3 Symbol and Code Number...2 4 Dimension and Tolerance...3 5 Materials...22 6 Manufacturing and Heat Treatment...23 7 Inspection...25 8 Design Verification Test...26 9 Product Test...28 10 Marking...28 11 Protection and Package...29 12 Product Quality Certificate...29 Appendix A (Informative) Inch size of Steel Butt-welding Seamless Pipe Fittings...30 Appendix B (Informative) Wall Thickness Classification of Seamless Steel Tube Connected With Pipe Fittings...44
Foreword This standard is a revision of GB/T 12459-1990 "Steel Butt-welding Seamless Pipe Fittings". This standard adopts ASME B 169: 2001 "Factory-Made Wrought Butt-welding Fittings" and is formulated in combination of the manufacturing condition in China by reference to the former standard. There are main differences between the standard and ASME B169:2001: Model (seamless), dimension (DN 800 and lower level) and technical requirements in this standard are of substantial agreement with ASME B 16.9, and the preparation format is deferent. The dimension of pipe fittings welding end connected with metric pipe commonly used in China, i.e. dimension of "series II" products; The decimal place of the "groove external diameter" in some specification are slightly different from the one of ASME B 16.9, e.g. the "groove external diameter" of DN20 pipe fittings, in ASME B 169, is 26.7 mm; and 26.9 mm in this standard. The following technical data are added: symbol and code number of pipe fittings, material, manufacturing and heat treatment, inspection, protection and package of product quality certificate, etc. There are main differences between the standard and GB/T 124591-1990: Add the explanation for symbols of pipe fittings; Add the dimension of lap joint stub end for flange connection according the requirement of ASME B 16.9; Expend the dimensional range from DN 15~DN 500 to DN 15 ~ DN 800, among them, the dimension range of long radius elbow, tee joint, cross joint, pipe cap and reducing joint is expanded from DN 15 ~DN 500 to DN 15 ~ DN 800; and the one of other pipe fittings is expanded from DN 15 ~ DN 500 to DN 15 ~ DN 600. Add the requirements in material and manufacturing process; supplement the requirements in design verification and revise the technical content like inspection. Appendix A and Appendix B of this standard are informative. This code is brought forwards by China Machinery Industry Federation. This national standard is under the jurisdiction of National Technical Committee 236 on Sliding Bearing of Standardization Administration of China. Drafting organizations: Academy of Machinery Science & Technology, wuxi xinfeng pipe-fittings Co,. Ltd., Cangzhou Bohai pipe-fittings Co., Ltd., Jiangyin Nanfang Pipe Fitting Making Co., Ltd., Shanghai Gaoqiao Pipe Fitting Making Co., Ltd., Tianjin Jinding Pipeline Co., Ltd., JinTong Petrochemical Pipe Fittings Co., Ltd., Jiangyin land and sea High Pressure Pipe Co., Ltd., Bengbu pipe fittings factory, Baogang Xingyuan Seamless Welfare Pipe Fittings Factory, Luoyang Petrochemical Corp., Central Southern China Electric Power Design Institute, Northeast Electric Power Design Institute Chief drafting staffs: Li Junying, Guo Shunxian, Zhu Quanming, Liu Shangci, Shen Peizhong, Xin He, Yao Mingwen, Zhu Xiaofeng, Wang Qingyao, Wang Hanqing, Li Suqin, Wen Qiding, Huang Tao, Wang Junsheng, Huang Guohong
Steel Butt-Welding Seamless Pipe Fittings 1 Scope This standard specifies the requirements in symbol and code number, dimension and tolerance, material, manufacturing, inspection, test, marking, protection and package of carbon steel, alloy steel and stainless steel butt welding of DN 15 ~ DN 800 (NPS 1/2 ~ NPS 24). 2 Normative Reference The following documents contain provisions which, through reference in this text, constitute provisions of this code. For dated reference, subsequent amendments (excluding correction) to, or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest edition of these documents is applicable. For undated references, the latest edition of the referenced document applies. GB 150 Steel pressure vessels GB/T 710 Hot-rolled quality carbon structural steel sheets and strips GB/T 711 Hot-rolled quality carbon structural steel plates sheets and wide strips GB/T 713 Steel plates for boilers GB/T 912 Hot-rolled sheets and strips of carbon structural steels and high strength low alloy structural steels GB/T 1047 Pipework components--definition and selection of DN (nominal size) (ISO 6708: 1995; MOD) GB 3087 Seamless steel tubes for low and medium pressure boiler GB/T 3274 Hot-rolled plates and strips of carbon structural steels and high strength low alloy structural steels GB/T 3280 Cold rolled stainless steel plate GB 3531 Low alloy steel plates for low temperature pressure vessels GB/T 4237 Hot rolled stainless steel plate GB/T 4238 Heat-resisting steel sheets and plates GB 5310 Seamless steel tubes and pipes for high pressure boiler GB 6479 Seamless steel tubes for high-pressure for chemical fertilizer equipments GB 6654 Steel plates for pressure vessels GB/T 8163 Seamless Steel Tubes for Liquid Service (neq ISO 559: 1991) GB/T 9118.1-2000 Loose hubbed steel pipe flanges with welding neck collar with raised face GB/T 9118.2-2000 Loose hubbed steel pipe flanges with welding neck collar with ring-joint face GB/T 9124-2000 Specification for steel pipe flanges GB/T 9948 Seamless steel tubes for petroleum cracking GB/T 14976 Stainless Steel Seamless Tubes for Fluid Transport (ASTM A 269: 2000 NEQ) 1
JB 4730 Nondestructive Testing of Pressure Vessels ASME B 16.5 Flanges and flanged fittings ASME B 16.9: 2001 Factory-Made Wrought Buttwelding Fittings ASME B 36.10M: 1996 Welded and Seamless Wrought Steel Pipe ASME B 36.19 M: 1985 (R 1994) Stainless steel tubes 3 Symbol and Code Number 3.1 Symbols DN Nominal dimension of metric pipe fittings; non-measured value (see GB/T 1047); NPs Nominal dimension of British pipe fittings, non-measured value; A Distance of a end face center to the other end face of 90 elbow; distance of 180 elbow center to end face center; B Distance from 45 elbow center to end face; C Distance from branch outlet axial line of tee joint and cross joint to central body end face; D Groove external diameter of elbow, straight tee and cross joint, and pipe cap; groove external diameter of reducing fittings large end; D 1 Groove external diameter of reducing fittings smaller end; E Total height of pipe cap (pipe seal head); F Length of lap joint stub end; G External diameter of lap joint; H Distance from a end face to the other end face of a reducing joint; K Distance of from a end face to the top of a 180 elbow; M Distance from main body center line to branch pipe end face of tee joint and cross joint; O Distance from a end face to the other end face of a 180 elbow; R Radius of rounded angle; t Required wall thickness of large end welding end of same-diameter or reducing fittings; t 1 Required wall thickness of smaller end welding end of reducing fittings; T Thickness of lap joint. 3.2 Code Number The type and code number of butt welding seamless pipe fittings are detailed in Table 1. Table 1: type and code number of pipe fittings Type Model Code number 45 elbow Long radius 45E (L) 90 elbow Long radius Short radius Long radius reducing 90E (L) 90E (S) 90E (L) R 180 elbow Long radius 180E (L) 2
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